Log-cutting machine.



J. E. MITCHELL & D. PARKS.

LOG CUTTING MACHINE.

APPLICATION FILED ocr. 4, 1916.

Patented Jan. I, 1918.

J. E. MITCHELL & D. PARKS.

LOG CUTTING MACHINE.

APPLICATION FILED OCT. 4. 1916.

Patented Jan. 1,1918.

6 SHEETS-SHEET 2 I f J fiemmm mwww 1. E. MITCHELL & D. PARKS.

LOG CUTTING MACHINE.

APPLlCATlON FILED OCT. 4, 1916.

1 ,252, 1 3'? Patente Jan. 1, 1918.

6 SHEETS-SHEET 3.

J. E. MITCHELL & D. PARKS. LOGYCUTTING MACHINE.

APPLICATION FILED OCT. 4. 1915.

1,955 1 37, Patented Jan. 1, 1918.

6 SHEETS-SHEET'Q.

J. E. MITCHELL & D. PARKS.

LOG CUTTING MACHINE.

APPLICATION FILED OCT. 4, I916- j ifigflfifi Patented Jan.1,1918.

6 SHEETS-SHEET 5- J. E, MITCHELL (Y: D. PARKS.

LOG CUTTING MACHINE.

APPLICATiON man OCT. 4. 1916.

Patented Jan. 1, 1918.

6 SHEETS-SHEET 6- JOHN E. MITCHELL ANDLDEN'NIS PARKS, OF LOUIS, MISSOURI.

Application filed G-ctober 4, 1916. Serial 110,123,618.

To all whom it may concern: p

Be it known that Live, Jo'rINjE. MITCHELL and DEN-Ms PARKS, citizens"oftheUnited States, residing in the city 'of St. Louis and State of Missouri, have invent'ed nev v and useful Improvements in Log-Cutting Ma'- chines, of Whichthe following is aspecific a tion.-

This invention" relates to the art of heel building, and has'forfits general object to provide a. novel machinevvliereby so-fcalled logs maybe readily 'cut into'sect'ions of heel blan'k size in a rapid ma out waste of mater1al.""

Statedmore in-detail', the invention has" for its sa'lient objects to"providef,means for.

circumferentially and progressively cuttii'i'g sections from a stationarydog; to provide: means for actuating a cutter whereby it. is

rotated about a" log andsimultaneously, movedinvvard' toward the axis thereof, and' after penetrating the log to the plane of the axis isautomatically withdrawn beyond the periphery of the log; to provide novelmeans for automatically advancing the log av predetermined distance after the cutter has removed asection'therefrom and been withdrawn; and'to provide novel means for auto matically clamping the log While being cut,

and to releasesaid log to permit it tobe fed forward. I

Further objects of'the invention relate to novel constructions, combinations and opera tionsof parts whereby the above objects are attained. I

Heretofore in se "aratin h'eel blank see A b tions from logs, it hasbeen the uniform custom to rotate the log and to advance a ro- 1 tary saw toward the axis ofthe log and in a plane at right angles thereto." The use of a" saw in'*severing the sections from the log necessarily entailsa considerable Waste of I material due to'the formationof sawdust. Moreovenas the circular saw can only be secured in its central porti0n, arelatively thick saw disk must be used to prevent bend- I ing and insure,'as near as'may be a' straight cut.- "To prevent theexce's'siv'e waste'fro ny saw dust which would 'result from'having the saxv of uniform; thickness throughout, the outer side of the s aw is provided wane;

beveled marginal" face to ltprm-"za' th ting 1 edge; This-results producing a central elevation on the side of nner and With- Whereas'the rotary savv now in this connection rapidlyjdulls and must, be frequently replaced, the knife-edge cuts.

' teremployed in the present machine H121 V l06- ofF1g.1;

Specification'of L'ettersfatent; 5 -Patented an, 1, 1918,

thebla'de bendingvin operation. Furthermore, as it ispractically impossible. to sever sections from a leather log thatwlll be ava lable for use as heel-blanks except by means ofa circumferential kert' or cut,

the necessit heretofore existin for ro tating thelog to accomplish this operation hasvrequired the employment of a rotary holder; for the log.- Mechanism for ro--- tati'ng thisholderis required in addition to that employed for rotatlng thesaiv; andas means are mounted on the log holder for clamping the log, and for automatically re leas ng 1t When the log s to beefed forward,

requiring the v cotirdination of actuating mechanism with the rotary log holder to accompl sh the clamp and release of the log,

the net result is a machine quite costly in construction, operation, and upkeep as com- This is due .tothe fact that in this latter no rota-- pared With the present machine.

tion of the log is required; all rotatable parts are mounted on or drlven from a slngle drive-shaft; the transverse movement of the cutter is effected by the mechanism which causes its rotation about the log; and, finally,

useda very long time before becoming dull,

and When this occurs, it may be removedand sharpened in a few minutes.

The invention is illustrated in the accompanying drawings, in hich-:-

Figure 1 is a side elevation of the completemachlne, a portlon being ShOWIlzlIl.

section 1n general use- Fig. 2 isa fragmentary view illustrating part, of the feeding mechanism Fig, 3 sea vertical logitudinal sectional! viewvgthe cutters b'einglomittgd; a

Kg. '45 is'a sectlonal view, on an enlarged Fig isa similar view on the line 55 scale, approximately on the line log.

Fig. 6 is a view in front elevation of the upper portion of the machine, the cutters being'shown'separated';

Fig. 7 is a detail view, partly in frontel'e vation and partlyin section, of the cutter head, the guard being removed and the cutters being shown in their closed relation,

Fig. 8 is a fragmentary sectional view of the cutter head show-in-g the position of the parts corresponding to those illustrated in 6;

Fig.- 9 is a fragmentary section on the line 9'9 of Fig.7 Fig. 10 is a. similar of Fig. 7 I 1 Fig. 11 is a fragmentary sectionon the line 11-11 of Fig. 6; and

view on the line 10-1O Fig. 12 is a view illustrating a modification of the cutters. I.

Referring now to the drawings, the numeral lrindicates, generally, the frame of *the machine, in which a drive shaft=2 is mounted in bearings 3. Mounted on one end of the drive shaft is a fast pulley 4 and a loose pulley 5. The shaft 2 is driven from the pulley 4 by an ordinary drive belt (not shown). On its upper side. and at the righthand end, as shown in Figs. 1 and 3, the frame 1 is provided with two cylindrical bearings 6, in which is rotatablyfmounted a sleeve 7. Mounted. on the vupper side of the frame 1 is a holder for a log, such as indi cated at 8. This holder-comprises a relatively long back-plate 9 which, as shown particularly in Figs. 5 and 6, is. troughshaped to conform somewhat to the rounded "or back side of the log, and what may be termed a breast-plate 10,; which is preferably considerably shorter than the backplate 9, and is flat on its inner side to conform to the shape of the breast side of the The back -plate 9 supports the log which is to be operated upon, and is made of suflicient length to accommodate the long est log or log section which would ordinarily be used. The back-plate 9 is secured at the rear end of the frame 1 in a bracket 11 by means of screws 11 and is raised somewhat above the upper side of the frame at this point. iThe bracket 11 is adjustable by means 'of'slots (not shown) and screws 11". Toward its forward end said back-platehas its bottom resting on and supported bythe upper end of an adjusting screw 12 which is secured in adjusted positions by a locknut13. Pivotally' mounted at'14: in a lug provided on the under side of the back-plate 9, and about centrally of its length, is a bifurcated lever 15, each arm 16 of which passes under the ends of a pivot rod 17 mounted in a lug 18, which in turn is mounted on the upper side of atop frame member downwardlysprojecting lug 20 which rests 19. 'On its under side each arm -16 is provided about centrally of its length with a upon the frame member 19 and upon which sa d arms are adapted to pivot or rock on said frame member. Extending upward fromthebreastplate 10 of the holder is a projection- 21. Extending from opposite sides of the projection 21 are bearings 22, see particularly Fig. 5, through which extends a pivot rod 23 (Figs. 1 and .3) on the outer ends'of which are pivotally mounted,

by means of integral bearings 24, the upper ends of a pair of arms 25, the lower portions of which afford vertically extending members 26 which intermediate their ends are apertured to loosely Ireceiveithe opposite ends of a pivot rod 27. A-This pivot rod also passes through the outer ends of the arms 16,0f the bifurcated lever 15 previously referredto, so that said arms 16 with their rocking points 20 resting on the upper frame member 19 constitute, through the pivot rod 27, andithe arms 2526 and rod 23, an adjustablesupportfor the upper-or breastplate 10 of the log holder. A further means of supporting the breast-plate 10 through the medium of the pivot rod 23 is provided by anear 27? having' a vertically-disposed slot 28 which receives a screw-threaded stud 29 .mounted on an upward extension 30 of the machine (Figs. 1 and 5), which extension is integral with-the innermost bearing 6 (Fig. 3) previouslyreferred to. The stud 29 is adapted to-receive a binding nut. 31. The pivot rod 23 is located slightly in ad-- Vance of thelcenter of the breast-plate 10 plate .10 downward, and, on the other hand,

after the adjusting screw 12 is unscrewed to lower the forward portion of the back plate 9, this operation will result in raising the arms 25 and hence the'breast-plate 10.

Inthis manner both plates of the-holder may be simultaneously adjusted to accommodate the size of the log from which heelblanks are to be cut. The vertical portions 26 of the arms 25 engage opposite side edges of the back-plate 9 andframexmember 19,

as shown by Fig. 5. The outer ends ofthe pivot rod 27 are screw-threaded, and loosely mounted on either end, of this rod is a collar 28 and beyond each collar a thumb-nut 29 has screw-threaded engagement with the rod 27. When the adjusting screw 12 has been turned to adjust the plates 9 and 10 as previously described. the thumb-nuts 29 andbinding nut 31 which, of course, had

been loosened, are then turned to bind the vertical portions 26 of the arms 25 against the side edges of'the'back-platefiand frame member 19 and theear'27 against the flat side of; the frame projection 30, respectively,

sides of this b'lock lugs 32 are provided in front of which extend lever arms The lower ends of'these lever arms are pivotally mounted on the outer reduced-portions, or

studs, 34 o fa cross-bar 35, the said lugs 34 having outer screw threaded ends for receiving'nuts 36 whereby the lower ends of the lever arms are retained in position on said cross-bar. The cross-bar 35 also provides an integral extension 37 at its center, and extending at rightangl'es thereto from the front and rear sides thereof, and in this extension37 is mounted an eye bolt 38 which passes through the extension 37 and receives on its outer screw-threaded end a thumb- ;nut 39 Secured in the eye of the bolt 38 is one end of a coil-spring 40, the opposite end of which" is secured in' the upper end of a lug 41 which is formed integral with a sleeve 42*acljustably secured on a stub shaft 43 bymeans of a binding screw 44. The upper ends of the lever arms 33 are pivotally mounted on the reduced'end-portions 45 of a cross barl6 (Fig. 5) v which normally engages the rear side of the lug 21. The

fcryv'ard'side' of 'eachof 'thelever arms 33 near its upperend is provided witha projection 47 Fig.1) carrying a hub 48, said hubs being loosely mountedcn the outer end portion's of the pivot rod 23 The cross-bar 4:6 isnormally held-in engagement with the lug 211 by the; spring etO 'whichnormally tend s'to draw the-lower ends'of the lever arms inward. "In such position the forward portion of the breast-plate 10 will be pressed: downward upon the forward portion of the log 8 to clamp said log between the breast plate andthe back-plate 9. Throughmechanism "to be described later, the main drive shaft :2 is at intervals given a longitudinal movement'toward' the forward end -of' the-machines. When this oc curs a collar 49' adjustably'secured on said shaft by a binding screw 5'0 is brought into contact with-.-the"slee've bearing 30,; forcing the lower-ends of the'lever arms' 33 outward or toward the front 0f the machine, and removing the'cross bar 46 from contact with tiono'f the breast-fplate 10,- {'which, as 'stated will tend to'slightly raise the forward portion and release the clamp thereof upon the log and permit its being fed forward as later to be described. The movements of the breast-plate 10 just described are very slight, being scarcely discernible, but they are suflicient both to clamp the log and to release it for the feeding movement. The engagement of the breast-plate with the flat or breast side of the log, also prevents the latter from turning during the operation of cutting the log, hereinafter described.

The holder formed by the plates 9 and 10 projects through and slightly beyond the 7 forward end of the sleeve 7 (Fi 3) and the method of cutting sections from the log 8 will now be described.

Formed integral with the sleeve 7 (Figs. 3, 7 and 8) and located near the forward end thereof is an annular flange 51 in which are screwed or otherwise fixedly secured two studs 52, 53. Rotatably mounted on the eX- treme forward end of the sleeve 7 is a gear 54 which is recessed on its inner side tc house the annular flange 51 but so as to leave an annular space 55 between the periphery of the flange and the inner circumference of the gear (Figs. 7 and 8). Said gear abuts against the front face of the annular flange 51 and is provided with curved slots 56 which receive and are adapted to work over the studs 52, 53, respectively. Mounted on the inner wall of the recess of the gear 54 is a stud 57 and mounted on the periphery of the-flange 51 is a similar stud 58. Secured at its opposite ends to the respective studs 57 and 58 and extending around the flange 51 in the space 55 is a coil spring 59. Pivotally mounted on the studs 52, 53, and located on the outside of the face of the gear 54 are arms 60, 61, each of which is provided'with a bow-shaped extension 62 and is apertured to receive a screw-threaded rod 63 in the inner end of which is secured'one end of a cutting blade 6%, the other end of which is secured in any suitable manner, as indicated 64. Each of the arms 60, 61, has at its outer end an aperture 67 (Fig. 10) for receiving a cylindrical shank 68 of an adjustable bearing 69. A set screw 70 passing through the end of the arm 60 and engaging the shank 68 holds the bearing 69 in any position to; which it may be turned in the aperture 67 The numeral 71 indicates an. arm which'is pivotally mounted at 7 2 (Fig. 9) at its outer end on theouter face of the gear 54 andnear the periphery thereof, and, has fixedly see cured in its inner-"end a pin 73 whichis ro tatably mounted" in' the bearing 69" accents:

Cally thereof. By loosening the screws and turning the bearings 69 the pin 73 may secured on the stub shaft and abutting against the end of the pinion 76 holds the gear in position on the stub shaft 43. Loosely mounted on the shaft 2 is a gear 78, the teeth of which are in mesh withjthe pinion 7 6. On its inner side the gear 78 is provided with a cam 79. On its opposite side the gear 78 is provided with an elongated hub 80 adjustably secured on which, by a set screw 81-, is a cam 82. A. collar 83, held by a set screw 84 on the shaft 2 and abutting against the end of the hub 80 maintains the gear Wheel 78 in its proper position on the shaft. Fixedly secured on the shaft 2 toward the outer end thereof is a gear 85, the teeth of which are in mesh with the teeth of a gear 86 which is fixed on the sleeve 7.-

Loosely mounted on the shaft 2 beyond the bearing 3 is a gear 87 which is recessed on its outer face to provide a seat for a friction ring 88. The teeth of the gear 87 are in mesh' numeral 91 indicates a lever which is pivotally mounted centrally of its length on the outer end of a rod 92 which is slidably mounted in a bearing 98 provided on the frame. The inner end of this rod is screwthreaded to receive an adjusting nut 94, and between the inner end of the bearing 3 and the adjusting nut is a coil spring 95. The numeral 96 indicates a stop against which the lower end of the lever 91 engages and which forms a pivot for said lever. The inner end of the shaft 2 is formed conical, as indicated at 97 tobe received in a corresponding recess formed in the upper end of the lever 91. As heretofore stated, the shaft ment between the sets of gears and 86 and 54 and 87, and this is accomplished by so proportioning the gears that the gear 54 will be driven at a slightly less rate of speed than the gear 86. This may be accomplished ,in various ways, but for convenience of illustration the gear 54 is shown to be of slightly larger diame'terthan the gear 86 and the gear 87 of slightly less diameter than the gear'54 or the gear85. As a result, the gear 85 will cause the gear 86 and the annular flange 51 to travelat a certain rate of speed,

While the gear 88 will cause the gear 54 to travel at a slower rate of speed than the annular flange 51, and thereby cause a lag in its movement. Thus, with the cutters64 in the open position shown in Fig. 6, and the machine being in operation, the annular disk 51 moving faster than the gear 54 will cause the pins 52 and 53 to gradually move from the position in the end of the slots 56 which they are shown to occupy in Fig. 6, and as shown with respect to the pin 52 in Fig. 9,:

to the opposite ends of said slots, or to that position they are shown to occupy in Fig. 7. This movement causes the cutters to come together at the axis of the log, or at the center of the holder, due to the leverage effected by the arms 71 which are pivotally mounted on the gear 54, and the arms 60 and 61, which are pivotally mounted on the annular flange 51. In this movement the arms 60 and 71 turn upon each other on the eccen- 2 tric pin 73 as a pivot. This relative movement between the annular flange 51 and the gear 54 also results in bringing the studs 57 and '58 from'the'widely-separated position they are shown to oc'cupyin Fig. 8 to the relatively close positionthey are shown to occupy in Fig. 7, which movementis against the resistance of the spring 59 and results, of course, in its extension. It now remains to describe the manner in which the cutters 64 are again brought to the open position shown in Fig. 6.

Secured on the frame of the machine (Fig. 3) is a bracket arm 98 at the outer end of which is mounted a roller 99. This roller is adapted to be engaged by the cam 79 on the gear 78. WVhen the studs 52 and 53 have reached the ends of the slots 56, or the positions they are shown to occupy in Fig. 7,

the gear 54 and the annular disk- 51 must necessarily travel at the same rate of speed. This continues, however, for only a short period of time to insure the completion of the'cut, and during this period the clutch.

member 89 will slip slightly over the friction ring 88. The adjustment of the machine, however, is such that at about this time the cam 79 will engage the roller 99,

and as the roller rides up on thecam the shaft 2 will be forced by the gear 78 to the right, as shown in Fig. 3, thereby moving the clutch member89 out of engagement with the friction ring 88'aga1nst the resist ance of the spring 95. As soon as the clutch member 89 is moved out of frictional en-- sult that it causes the disk 54 to be rotated wee rapidly until the opposite ends of the slots I rect1'on,''''and against the resistance of the from those shown to be engaged by the pins 52 and 53 in Fig. 7 will be moved intoengagement with said pins, or to the position shown in Fig. 6 and Fig' 8. It will be noted that there is practically no resistance to this movement as the gear 87 is loosely mounted on the shaft 2, and the gear 54'isfloose1y mounted on the sleeve 7. The above operation occurs rapidly, and as soon as the cam v the spring 111 eaus'es the return 'of the feed- 79 rides off of the'roller 99 the spring 95 draws the lever 91 inward, again forcing the clutch member 89 into frictional engagement with the friction ring 88, and the preceding operations are repeated. Before this latter movement occurs, however, it is necessary to feed the work forward in order to present a fresh portion for the cutters to act upon. This is accomplishedby the following mechanism, referring more particularly to Figs. 1, 3 and 4:

Pivotally mounted at its lower end on studs 100 provided at opposite'ends of a cross-bar 100 formed integral with the collar 42 1s a yoke-frame comprising side bars 101 connected by a cross-bar 102. The upper end of each ofthe side bars is U-shaped providing an open end slot 103, and these slots engage over studs 104 mounted on opposite sides of a' feeding carriage comprising side members 105 mounted on the reduced end portions of cross-bars 106, said reduced end portions being screw-threadedand receiving nuts 107. The upper ends of the side members 105 are shaped 'toprovide rectangular recesses 108 which slidablyengage flanges 109 provided on opposite sides of the 7 lower or back-plate9Q The rear cross-bar 106 has mounted in it an eye bolt 110 to which is secured one end of a coil springlll the opposite end of'w'hich is secured in an an eye bolt 112 mounted on the bracket 11 which supports the back-plate 9. PiVOtally mounted on studs 113 (Fig.2) at either end of the side members 105 are dogs 114 having curved serrated edge portions 115' which extend over the opposite side edges ofthe baclnplate 9 in a position to engage the op posite sides of the log 8. The dogs 114 have pins 116 projecting upwardly from their hubs'above and below the pivot studs 113,

respectively, and a spring 117 connects the pins 116 and tends normally to draw the serrated edges 115 inward into engagement with the sides of the log. Mounted 'on the cross-bar 102 is a roller 118 which is in the path of the cam 82mounted on the hub of'the gear 78 heretofore described. The operation of the parts is so timed that iasthe cutters 64 are opened in the mannerpre "mainifiguresbf the drawingsflsuch an arviously described the cam 82 will engage the roller 118' thereby moving the upper ends-of V the side bar's 101J toward the front offtne" machine, which movement, through the engagementof said bars with the studsf'104, p A

"' 'ward 'i novement of said "log;

" The c'utters" 64 are mounted to rotate in moves the feedingcarriage in a similar dispring 111. In this movement the dogs 114 {being engagm'entwiththefsides of the log' are caused to jbite i'nto the same and to move it; forward through the holder a dis n'ce'equal tothe length of the section to be 'sev'ered from amen of theheel'log. :As

soon as; thisjfeedingj operation is completed the cam 82 jridesoff of the roller=1l8 and I ingca'rriage and yoke'ffra'me' to their" origibars l'0l sha'll' move in the'feeding operation. In ordef'to preventlthe dogs 114 from pulling the log back intheir return movement aserrated dog 120' (Figs! and'4') pivotallyinountedon arod121' supported in" "lugs 122 extending upward from the breastplate' 10 is arranged'tobear by gravity upon "the" log through a recess 123 in said breastplate and to arrest any tendency to backclose pi-dximit toj the end of the holder, as

fshown more clearly in Figs. 1,6 and 11, and 'as' they are continuously rotated about the log and have a movement towardeachother;

" theresult accfomplishechis that thejend of the logjprojecting beyond the'holderis severed by a circumferential'and progressive cutting movement, the out being completed I get'her showh iniliiggi. 7. "In the modification illustrated in Fig, 12

a blade i124 is employed" which is" quadrantshaped,andftlie arins 60a'nd61 are provided with curved "eXtensions'125, eachfof which is"re'cessed on 'itsiinder sidejto receive the curvedeolge portion jof the blade whichis provlded w th apertures and secured in "position by meansofscrews 126i The opposing when the edges of the knifel'a're brought to edge portions of these blades are beveled on their outer sfides,*'a"s indicated at 127, and

sharpened 'toa knife edge "For manyrew sons' tliis forni' jo f "cutter is"preferred, as it can be secured in 'its"holderfin' very rigid V manner, being braced around its entire outer periphery, and hence permits of a relatively "thin blade beingused; However, with either fform offbladelshown, it is possible to employ inuch thiiinen' material than it has' been foundpossible tdjuse with the'circularsaws heretofore employed. It will' furthermore be understood that' while it is desirable for the sake of rapidity or operation to employ twdopp'osiii'g cutters as illustrated in the is not essential'fto the satisfac- V tory'idperation of are ifriachin, as a single "c'utt'er ofeither' disclosed will sever seca manner as two cutters, but not so rap-- idly.

It will now be seen that the dominating characteristic of the present invention is the provision of rotaryv knife-edged cutting members which operate to sever sections from the log by producing a progressive circumferential cut, as distinguished from a sawing action; and that this operation is performed while the log is stationary, thus simplifying the operation by dispensing with the necessity of providing the construction and mechanism necessary to enable the log holder to .be rotated. The operation'of cutting is very rapid, there is an utter absence of the production of saw dust, thus eliminating all waste, and the thinness of the blades which it is found possible to employ reduces to. the minimum the distortion of the section. .of the log belng cut off, such distortion being very considerable inthe'machme heretofore generallyv used, due to the production of a relatively Wide kerf by thebeveled edge of the relatively thick saw employed. The sections cut off by the present machine have practically straight sidesand are in better condition for forming heels than where, as heretofore, they are somewhat concaved on i one side and have a central projection, or

convex surface, on the other.

In order to insure the discharge of the cutofl" sections away from the machine, and to prevent the cut-off sections from being thrown laterally outward by centrifugal force,' a cup-shaped guard 128 (Figs. 3 and 6) is mounted on the outer endsof the studs 52, 53, its inner end being open, as indicated I The opening 129 isv slightly larger than the diameter of the at 129., and circular.

holder, as .shown2by Fig.6, and lies in close proximity thereto sothat as the log sections" are cut off they will be compelled to fall away fromthe machine, and be prevented from being thrown outward laterally. We claim: 1. In a machine of the class described, in

combination with a relatively stationary log holder, a pivotally mounted cutter, means for rotating said cutter around a log held against, longitudinal movement in said holder and for progressively turning the cutter about its pivot toward the axis of the:log,

and means for automatically withdrawing said cutter when its cutting edge has crossed the axis of thelog.

y 2. In amachine of the class described, in combination with a log holder, an arm pivotally mounted intermediate its ends and carrying a cutter, driving mechanism for rotating saldarmaround a log held agalnst longitudlnal movement 1n sald holder and simultaneously turning the arm about its pivot to move the cutter inward, or toward.

the axis of the log, and automatic means cooperating with said driving mechanism to turn the arm outward and withdraw the cutter after its cutting edge has passed the axis of'the log.

i 3. In a machine of the class described, a-

log holder, a pair of rotatable members mov able in a plane at right angles to the axis of said holder, an arm pivotally mounted intermediate its ends on one of said members, actuating mechanism operatively connecting one end of said arm with the other rotatable member, and means for driving said rotatable members at different rates of speed whereby said mechanism will be caused to move the free end portion of said arm inward on arcual lines to carry the cutter to-' ward the axis of said holder.

4. In a machine ofthe class descrlbed, a

log holder, a pair of rotatable members movable in a plane at right angles to the axis of said holder, an arm pivotally mounted intermediate its ends on one of said members, ilever mechanism plvotally connecting one end of said arm with the other rotatable member, a cutter carried by the free end portion of said arm, and means for driving said rotatable members at different rates of speed whereby said lever mechanism will cause the movement of the free end portion of said arm inward on arcual lines to carry the cutter toward the axis of said holder.

5. Ina machine of the class described, a log holder, a pair of rotatable members movable in a plane at right angles to the axis of the holder, a cutter pivotally mounted on.

one of said members, actuating mechanism ter pivotally mounted on one of said members, lever mechanism pivotally connecting said cutter with 'theother member, means for simultaneously driving said members at different rates of speed whereby said lever mechanism will cause the movement of said cutter toward the axisof said holder, and T means for accelerating the movement of the slower moving member to cause said lever mechanism to restore the cutter to its normal position. I

7. In a machine of the class described, a log holder, a pair of rotatable members movable in the same direction in a plane at right angles to the. axis of said holder, a cutter pivotally mounted on one of said members, actuating mechanism operatively described, a I.

connecting said cutter with the other of said members, means for simultaneously driving said members at different rates of speed whereby said mechanism will cause the movement or said cutter toward the axis of said holder, means for releasing the driving mechanism from engagement with one of said rotatable members, and automatic means for acceleratingthe movement of the slower moving member to cause said mechanism to restore the cutter to normal position.

8; In a machine of the class described, a log holder, a pair of rotatable members movable in the same direction in a plane at right angles to the axis of said holder, a cutter pivotally mounted on one. of said members, lever mechanism "pivotally connecting said cutter with the other of said members, means for simultaneously driving said members at different rates of speed whereby said lever mechanism will cause the movement of said cutter toward the axis of said holder, means for releasing the driving mechanism from engagement with one of said rotatable members,and automatic means for accelerating the movement of the slower moving member to cause the lever mechani sm to i'estorethe cutter to normal position.

in r

9. In a machine of the class described, a log holder, a pair of rotatable members mov able in. the same direction in a plane at right angles to the axis of the holder, a cutter pivotally mounted on one of said members, actuating mechanism operatively connecting said cutter with the other of said members, driving mechanism operating to simultaneouslyrotate said members at difierent rates of speed, whereby said mechanism will cause the movement of said cutter toward the axls of said holder,.means operated by the machine for automatically releasing the driv-- ing mechanism from engagement with one of said rotatable members, and automatic means operating, upon the release of said driving mechanism, to accelerate the movement of said slower moving member to cause said mechanism to restore the cutter to normal position. i l

10. In a machine of the class described, a log holder,a pair of rotatable members movable in a plane atright anglesto the axis of said holder, a cutter pivotally mounted on one of said members, actuating mechanism operatively connecting said cutter with the other rotatable member, means for drivingsaid rotatable members at different rates of speed whereby said mechanism will be caused to move said cutter toward the axis of said holder, a tension'device resisting the differential movement between said rotatable members, and means for disengaging the driving means from one ofsaid, rotatable members whereby said tension device will advance the slower moving member and restore the cutter to normal pos tion,

the machine for automatically releasing the driving mechanism from engagement with. one of said rotatable members, ancbautomatic means operating, upon the release of said driving mechanism, to accelerate the movementvof said slower moving member to cause said a lever mechanism to restore the cutter to normal position.

12. In a machine of the class described, a log holder, a pair of rotatable members movable in a plane at right angles to the axis of said holder, a cutter pivotally mounted on one of said members. lever mechanism pivotally connecting said cutter with the other of said members, means for driving said members simultaneously at different. rates of speed whereby said lever mechanism will cause the movement of said cutter toward the axis of said holder, a tension device resisting the difierential movement between said rotatable members, and means for disengaging the driving means from one of said rotatable members whereby said tension device will advance the slower moving memher and restore the cutter to normal position.

13. In a machine of the class described, a

log holder,a pair of rotatable members mov-' ablein the same direction in a plane at right angles to the axis of said holder, a cutter pivotally mounted on one of said members, actuating mechanism operatively connecting said cutter with the other of said members,

means for simultaneously driving said members at different rates of speed whereby sald mechanism will cause the movement of saidlcutter toward the axis of said holder,

, means for releasing the driving mechanism from engagement with one of said rotatable members, automatic means for accelerating the movement of the slower moving member to cause said mechanism to restore thecutter to normal position, and automatic means for restoring the engagement of the driving mechanism.

14:. In a machine of the class described, a log holder, a pair of rotatable members movable'in the same direction in a plane at right angles to the axis of said holder, a cutter pivotally mounted on one of said members, lever mechanism pivotally con-- necting said cutter with the other of said members, driving mechanism for simultaneously rotating said members at different rates of speed whereby said lever mechanism will cause the movement of the cutter toward the axis of said holder, a spring opposing the differential movement between said rotatable members, and means for automatically releasing said driving mechanism from engagement with one of said rotatable members when the cutter has crossed the axis of the log being out, said spring being operable thereupon to accelerate the movement of the slower moving member to cause said lever mechanism to restore the cutter to normal position.

15. In a machine of the class described, a log holder, a cutter movable in a plane at right angles to the axis of the holder, a rotatable member on which said cutter is pivotally mounted, a driven gear movable in the same direction as said rotatable member, lever mechanism connecting said cutter with said gear, driving mechanism, means for rotating said gear and rotatable members from said driving mechanism, the gear being driven at a slower rate of speed than said rotatable member, whereby said lever mechanism will cause the movement of said cutter toward the axis of said holder, and

means operating independently of the driving mechanism for restoring said cutter to normal position after its cutting edge has crossed the axis of the log being cut.

16. In a machine of the class described, a log holder, a pair of rotatable members movable in the same direction in a plane at right angle to the axis of said holder, a cutter pivotally mounted on one of said members, lever mechanism pivotally connecting said cutter with the other of said members, means for driving said rotatable members at diflferent rates of speed whereby said lever mechanism will cause the movement of said cutter toward the axis of said holder, and

' means for adjusting the throw of said lever mechanism.

'17. In a machine of the class described, a log holder, a rotatable member movable in a plane at right angles to the axis of said holder, a stud mounted on said member, a gear rotatably mounted on said rotatable member and provided with a slot for receiving said stud, an arm pivotally mounted intermediate its ends on said stud, a cutter mounted in one end portion of said arm, a lever pivotally connecting the other end of said arm with said gear, means for simultaneously rotating said member and said gear, but the gear at a slower rate of speed than said rotatable member whereby said studs will be carried forward in saidslots by said rotatable member to cause the lever mechanism to move said cutter toward the axis of the log being cut, a coil spring connected at its opposite ends, respectively, to said gear and said rotatable member, and

opposing the differential movement between 1 19. In a machine of the class described, a

log holder comprising a pivotally-mounted back-plate, a lever pivotally mounted at one end thereto and having rocking engagement with the frame of the machine intermediate its ends, abreast-plate, arms pivotally connected at their upper ends to said breastplate and at their lower ends to the outer end of said lever, means for adjusting the elevation of said back-plate whereby through said lever and arms to imultaneously move the breast-plate toward or from the back-plate, and means for locking said plates in their adjusted positions. H

20. In a machine of the class described, a log holder comprising a relatively stationary back-plate and a pivotally-supported breast-plate, a member operatively engaging said breast-plate to force the forward portion of the breast-plate into clamping engagement with the log, and means operated by the machine to release at intervals theengagement of said member and the con- Tequent pressure of the breast-plate on said 21. In a machine of the class described, a log holder comprising a relatively stationary back-plate and a pivotally-supported breast-plate, a member operatively engaging said breast-plate to force the forward portion of the breast-plate into clamping engagement with the log, means operated by the machine to release at intervals the engagement of said member and the consequent pressure ofthe breast-plate on said log, and means for advancing the log during the period when the pressure of the breastplate thereon is released.

22. In a machin /of the classidescribed,

a log holder comprising a back-plate and a.

advancing the log during the period when the pressure of the breastplatethere0n is released. a

In a machine of the class described, in combination witha log holder, differential. driving mechanism, a cutter pivotally mounted at separated points, respectively, to two members of said differential driving mechanism, whereby said cutter may be rotated about the axis of theholder and simultaneously moved toward said axis, a slidably-mounted" drive shaft from which said driving mechanism is actuated, a clutch member carried by the driving shaft and frictionally engaging one member of the driving mechanism, means operated by the machine to move said shaft longitudinally to release said clutch member from engage ment with its corresponding driven member, and automatic means operating on the release of said clutch to accelerate the movement of the slower of the differential members actuating said cutter whereby to restore the latter to normal position.

24. In a machine of the class described, in combination with a log holder, differential driving mechanism, a cutter pivotally mounted at separated points, respectively, to two members of said differential driving mechanism, whereby said cutter may be rotated about the axis of the holder and simultaneously moved toward said axis, a slidablymounted drive shaft from which said driving mechanism is actuated, a clutch member carried by the driving shaft and frictionally engaging one member of the driving mechanism, means operated by the machine to move said shaft longitudinally to release said clutch member from engagement with its corresponding driven member, automatic means operating on the release of said clutch to acceleratethe movement of the slower of the differential members actuating said cutter whereby to restore the latter to normal position, and automatic means for moving the shaft in the opposite direction and restoring the engagement of the clutch member with its driven member.

25. In a machine of the class described, in combination with a log holder, differential driving mechanism, a cutter pivotally mounted at separated points, respectively, to two members of said differential driving mechanism, whereby said cutter may be rotated about the axis of the holder and simultaneously moved toward said axis, a slidablymounted drive shaft from which said driving mechanism is actuated, a clutch member carried by said shaft and frictionally engaging one member of the driving mechanism, means operated by the machine to move said shaft longitudinally to release said clutch member from engagement with its corresponding driven member, automatic means operating on the release said clutch to accelerate the movement of the slower of the differential members actuating said outter whereby to restore the latter to normal position, means operated from said shaft to advance the logvwhile said clutch member isdisengaged, and automatic means for moving the shaft in the opposite direction and restoring the engagement of the clutch menr her with its driven member.

26.; In amachine of the class described, a log holder comprising a back-plate and a pivotally-mounted breast-plate, a pivotallymounted, spring-pulled lever operatively engaging said breast-plate under the pull of said spring to force it into clamping engagement with a log mounted in the holder, a feed device for engaging said log, a rotatable cutter, a slidably-mounted drive shaft from which said cutter is operated, a contact-member on said drive shaft for engaging said lever, and mechanism operating in the rotation of said drive shaft to move the latter longitudinally and bring said contact device into engagement with said lever whereby to release pressure upon said breastplate, and mechanism operated thereupon to move said feed device and thereby advance the log.

27. In a machine of the class described, in combination with a log holder, a pair of opposing cutters operatively mounted with respect to said holder and adapted to have arcual movement, and means for simultaneously actuating said cutters to cause them to continuously encircle and progressively move inward toward the axis of a log held in said holder, until their cutting edges are brought in line substantially at the axis of the log.

28. In a machine of the class described, in combination with a log holder, a pair of opposing cutters operatively mounted with respect to said log holder, means for simultaneously rotating said cutters around a log held in said holder and for progressively and continuously moving them inward on arcual lines until their cutting edges are brought in line at the axis of the log, and means for automatically separating said cutter-s.

29. In a machine of the class described, a log holder, a pair of rotatable members movable in a plane at right angles to the axis of said holder, a pair of cutters pivotally mounted in opposed relation on one of said members, actuating mechanism operatively connecting said cutters with the other rotatable member, and means for driving said rotatable members in the same direction at different rates of speed whereby said mechanism will be caused to move said cutters toward each other until their cutting edges are brought in line at the axis of the log being cut.

30. In a machine of the class described, a log holder, a pair of rotatable members mov able in a plane at right angles to the axis of said holder apair of cutters pivotally mounted in opposedrelation on one of said members actuating mechanism operatively connecting said cutters With the other rotatable member, means for driving said rotatable members in the same direction at different rates of speed whereby said mechanism Will be caused to move said cutters toward each other until their cutting edges are brought in line at the axis of the log bein cut and means for automaticall a'c-' celeratingthe movementof the slower of said driven members whereby said mechanism Will be caused to reverse the pivotal JOHN E. MITCHELL. DENNISPARKS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, 7 Washington, D. C. i 

